/Engine/Source/Developer/DerivedDataCache/Public/DerivedDataCacheInterface.h
Starts the async process of checking the cache and if the item is present, retrieving the cached results, otherwise telling the deriver to build the data and then updating the cache If the plugin does not support threading, all of the above will be completed before the call returns.
a handle that can be used for PollAsynchronousCompletion, WaitAsynchronousCompletion and GetAsynchronousResults
uint32 GetAsynchronous ( class [FDerivedDataPluginInterface](API\Developer\DerivedDataCache\FDerivedDataPluginInterface) * DataDeriver )